Will a front valance from a 71/72 Mustang bolt up to a car with 73 fender? Aside from the fact that the 71/72 has the turn signals mounted on it, are the dimensions the same?
Tough call. I'd say they are interchangable, though I've never had cause to try it. Dimensionally they appear identical. The only difference I can see (other than the signal lights you mentioned) is larger clearance recesses provided on the 73 valance to clear the larger bumper mounting brackets, though I don't expect that would be a real issue.
The 73 valance actually has extended tabs where the signal lights would (could) be, as if their deletion was an afterthought - or the 71-72 tooling was used to make it.
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Will a front valance from a 71/72 Mustang bolt up to a car with 73 fender? Aside from the fact that the 71/72 has the turn signals mounted on it, are the dimensions the same?